Chloride-free ammonia-free environment-friendly type concrete antifreezing agent

Abstract

The invention discloses a chloride-free ammonia-free environment-friendly type concrete antifreezing agent and relates to the technical field of concrete admixtures. The antifreezing agent is prepared from, by weight, 70-80 parts of polyacrylamide, 25-30 parts of modified starch, 20-25 parts of sorbitol, 15-20 parts of polyamide resin, 15-20 parts of methyl silicone oil, 12-18 parts of tea saponin, 10-15 parts of alkyl glycoside, 10-15 parts of sodium alpha-olefin sulfonate, 8-12 parts of diethyleneglycolmonomethylether, 8-12 parts of gleditsia sinensis powder, 6-10 parts of cyclodextrin, 6-10 parts of naphthalene water reducer, 4-7 parts of calcium aluminate, 50-60 parts of glycerinum and 200-250 parts of water. The prepared antifreezing agent is high in water-reducing rate and good in plasticity retention performance, the water freezing point can be greatly lowered, it is guaranteed that concrete is not damaged due to freezing at a low temperature (above minus 15 DEG C), and normal running of winner construction is guaranteed.

Description

Technical field: [0001] The invention relates to the technical field of concrete admixtures, in particular to a chlorine-free and ammonia-free environment-friendly antifreeze for concrete. Background technique: [0002] Concrete antifreeze refers to a concrete admixture that can continuously hydrate and harden concrete at negative temperatures, and achieve expected performance under specified curing conditions. In my country's "Three North" regions, winter lasts for a long time and the construction period is shortened. When the temperature is lower than 0°C, the freezing of concrete mixing water will not only cause the cement hydration to stagnate, but also the volume expansion caused by water freezing will cause Therefore, adding antifreeze to negative temperature concrete to prevent freezing is a common technical means for concrete winter construction. [0003] At present, the antifreeze agents used are mainly some inorganic salts and their compounds. Although these antifr...

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Problems solved by technology

[0003] At present, the antifreeze agents used are mainly some inorganic salts and their compounds. Although these antifreeze agents have a good effect on lowering the freezing point and promoting the strengthening of negative temperature concrete, they all have varying degrees of adverse effects on the durability of concrete, such as Chloride ions lead to corrosion of steel bars, sodium ions lead to alkali-aggregate reaction, and a large amount of inorganic salts are added, especially nitrite, which is highly toxic and pollutes buildings and the surrounding environment.